If your car blows A LOT of white smoke out the tailpipe and it smells sweet, your coolant is probably seeping into the motor through a leak in the head gasket. Check the inside of your oil cap for whitish sludge - this indicates coolant in the oil and usually verifies a head gasket leak.
If you drive with no antifreeze in your radiator you could ruin the motor. At a minimum you would probably blow a head gasket. The worse thing that can happen is that the motor will freeze up.
wash it out quickly, bugs carry germs that could kill you
Yes, antifreeze can leak from a water pump gasket.
Well, you could get a tummy ache or you might choke so...I suggest you don't do that. :)
Thermostats determine when antifreeze enters the main cooling system. If the thermostat isn't working correctly, the antifreeze could enter the engine to late, (or not at all) resulting in an over heating engine. Another problem of having antifreeze enter the engine late, is that if your engine is very hot, possibly a little warmer than common, when the antifreeze enters the engine, the cold fluid could cause the engine block to cool down quickly, causing a cracked engine block.
Antifreeze is composed of mainly ethylene glycol or propylene glycol, both of which are combustible. So yes, antifreeze IS combustible. However, neither of these compounds is very easily ignited. But although it is HIGHLY unlikely that antifreeze could start a fire, antifreeze could be dangerous if it actually gets hot enough to burn (such as in an ongoing structure fire).
My 3.8 Impala had a slight antifreeze smell from the engine compartment, and was much worse at the exhaust It was also missing, the problem was the upper intake plenum. I know that on this motor it is a common problem, and can quickly progress to the point of the car no longer running. You could have a small leak anywhere that is evaporating before it can drip.
if it rear air and heat it could be the line carring the antifreeze tho the back heater core.
Could be oil mixing with antifreeze indicating a bad head gasket Are you losing motor oil?
Antifreeze could be running out often due to a leak. It is important to inspect the radiator for small cracks or smoke.
Could be a few things. Does it leak antifreeze? if so, fix the part that leaks. If not, you could have coolant mixing with oil inside the engine, which burns it. check your spark plugs. If they are white, you are probably burning antifreeze - fix immediately. your exhaust will smell "sweet" as well if you are burning antifreeze.
out the tail pipe